1 /* 2 * This file is part of wl1271 3 * 4 * Copyright (C) 2009 Nokia Corporation 5 * 6 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 * 22 */ 23 24 #include <linux/gfp.h> 25 #include <linux/sched.h> 26 27 #include "wlcore.h" 28 #include "debug.h" 29 #include "acx.h" 30 #include "rx.h" 31 #include "tx.h" 32 #include "io.h" 33 #include "hw_ops.h" 34 35 /* 36 * TODO: this is here just for now, it must be removed when the data 37 * operations are in place. 38 */ 39 #include "../wl12xx/reg.h" 40 41 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, 42 u32 rx_pkt_desc) 43 { 44 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 45 return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> 46 ALIGNED_RX_BUF_SIZE_SHIFT; 47 48 return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; 49 } 50 51 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) 52 { 53 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 54 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); 55 56 return pkt_len; 57 } 58 59 static void wl1271_rx_status(struct wl1271 *wl, 60 struct wl1271_rx_descriptor *desc, 61 struct ieee80211_rx_status *status, 62 u8 beacon) 63 { 64 memset(status, 0, sizeof(struct ieee80211_rx_status)); 65 66 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) 67 status->band = IEEE80211_BAND_2GHZ; 68 else 69 status->band = IEEE80211_BAND_5GHZ; 70 71 status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); 72 73 /* 11n support */ 74 if (desc->rate <= wl->hw_min_ht_rate) 75 status->flag |= RX_FLAG_HT; 76 77 status->signal = desc->rssi; 78 79 /* 80 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we 81 * need to divide by two for now, but TI has been discussing about 82 * changing it. This needs to be rechecked. 83 */ 84 wl->noise = desc->rssi - (desc->snr >> 1); 85 86 status->freq = ieee80211_channel_to_frequency(desc->channel, 87 status->band); 88 89 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { 90 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; 91 92 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | 93 RX_FLAG_DECRYPTED; 94 95 if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { 96 status->flag |= RX_FLAG_MMIC_ERROR; 97 wl1271_warning("Michael MIC error"); 98 } 99 } 100 101 if (beacon) 102 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel, 103 status->band); 104 } 105 106 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, 107 enum wl_rx_buf_align rx_align, u8 *hlid) 108 { 109 struct wl1271_rx_descriptor *desc; 110 struct sk_buff *skb; 111 struct ieee80211_hdr *hdr; 112 u8 *buf; 113 u8 beacon = 0; 114 u8 is_data = 0; 115 u8 reserved = 0; 116 u16 seq_num; 117 u32 pkt_data_len; 118 119 /* 120 * In PLT mode we seem to get frames and mac80211 warns about them, 121 * workaround this by not retrieving them at all. 122 */ 123 if (unlikely(wl->plt)) 124 return -EINVAL; 125 126 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); 127 if (!pkt_data_len) { 128 wl1271_error("Invalid packet arrived from HW. length %d", 129 length); 130 return -EINVAL; 131 } 132 133 if (rx_align == WLCORE_RX_BUF_UNALIGNED) 134 reserved = RX_BUF_ALIGN; 135 136 /* the data read starts with the descriptor */ 137 desc = (struct wl1271_rx_descriptor *) data; 138 139 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 140 size_t len = length - sizeof(*desc); 141 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 142 wake_up_interruptible(&wl->fwlog_waitq); 143 return 0; 144 } 145 146 switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { 147 /* discard corrupted packets */ 148 case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: 149 case WL1271_RX_DESC_DECRYPT_FAIL: 150 wl1271_warning("corrupted packet in RX with status: 0x%x", 151 desc->status & WL1271_RX_DESC_STATUS_MASK); 152 return -EINVAL; 153 case WL1271_RX_DESC_SUCCESS: 154 case WL1271_RX_DESC_MIC_FAIL: 155 break; 156 default: 157 wl1271_error("invalid RX descriptor status: 0x%x", 158 desc->status & WL1271_RX_DESC_STATUS_MASK); 159 return -EINVAL; 160 } 161 162 /* skb length not including rx descriptor */ 163 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 164 if (!skb) { 165 wl1271_error("Couldn't allocate RX frame"); 166 return -ENOMEM; 167 } 168 169 /* reserve the unaligned payload(if any) */ 170 skb_reserve(skb, reserved); 171 172 buf = skb_put(skb, pkt_data_len); 173 174 /* 175 * Copy packets from aggregation buffer to the skbs without rx 176 * descriptor and with packet payload aligned care. In case of unaligned 177 * packets copy the packets in offset of 2 bytes guarantee IP header 178 * payload aligned to 4 bytes. 179 */ 180 memcpy(buf, data + sizeof(*desc), pkt_data_len); 181 if (rx_align == WLCORE_RX_BUF_PADDED) 182 skb_pull(skb, RX_BUF_ALIGN); 183 184 *hlid = desc->hlid; 185 186 hdr = (struct ieee80211_hdr *)skb->data; 187 if (ieee80211_is_beacon(hdr->frame_control)) 188 beacon = 1; 189 if (ieee80211_is_data_present(hdr->frame_control)) 190 is_data = 1; 191 192 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); 193 wlcore_hw_set_rx_csum(wl, desc, skb); 194 195 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 196 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 197 skb->len - desc->pad_len, 198 beacon ? "beacon" : "", 199 seq_num, *hlid); 200 201 skb_queue_tail(&wl->deferred_rx_queue, skb); 202 queue_work(wl->freezable_wq, &wl->netstack_work); 203 204 return is_data; 205 } 206 207 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status_1 *status) 208 { 209 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; 210 u32 buf_size; 211 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 212 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 213 u32 rx_counter; 214 u32 pkt_len, align_pkt_len; 215 u32 pkt_offset, des; 216 u8 hlid; 217 enum wl_rx_buf_align rx_align; 218 int ret = 0; 219 220 while (drv_rx_counter != fw_rx_counter) { 221 buf_size = 0; 222 rx_counter = drv_rx_counter; 223 while (rx_counter != fw_rx_counter) { 224 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); 225 pkt_len = wlcore_rx_get_buf_size(wl, des); 226 align_pkt_len = wlcore_rx_get_align_buf_size(wl, 227 pkt_len); 228 if (buf_size + align_pkt_len > wl->aggr_buf_size) 229 break; 230 buf_size += align_pkt_len; 231 rx_counter++; 232 rx_counter %= wl->num_rx_desc; 233 } 234 235 if (buf_size == 0) { 236 wl1271_warning("received empty data"); 237 break; 238 } 239 240 /* Read all available packets at once */ 241 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 242 ret = wlcore_hw_prepare_read(wl, des, buf_size); 243 if (ret < 0) 244 goto out; 245 246 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, 247 buf_size, true); 248 if (ret < 0) 249 goto out; 250 251 /* Split data into separate packets */ 252 pkt_offset = 0; 253 while (pkt_offset < buf_size) { 254 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 255 pkt_len = wlcore_rx_get_buf_size(wl, des); 256 rx_align = wlcore_hw_get_rx_buf_align(wl, des); 257 258 /* 259 * the handle data call can only fail in memory-outage 260 * conditions, in that case the received frame will just 261 * be dropped. 262 */ 263 if (wl1271_rx_handle_data(wl, 264 wl->aggr_buf + pkt_offset, 265 pkt_len, rx_align, 266 &hlid) == 1) { 267 if (hlid < WL12XX_MAX_LINKS) 268 __set_bit(hlid, active_hlids); 269 else 270 WARN(1, 271 "hlid exceeded WL12XX_MAX_LINKS " 272 "(%d)\n", hlid); 273 } 274 275 wl->rx_counter++; 276 drv_rx_counter++; 277 drv_rx_counter %= wl->num_rx_desc; 278 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); 279 } 280 } 281 282 /* 283 * Write the driver's packet counter to the FW. This is only required 284 * for older hardware revisions 285 */ 286 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { 287 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, 288 wl->rx_counter); 289 if (ret < 0) 290 goto out; 291 } 292 293 wl12xx_rearm_rx_streaming(wl, active_hlids); 294 295 out: 296 return ret; 297 } 298 299 #ifdef CONFIG_PM 300 int wl1271_rx_filter_enable(struct wl1271 *wl, 301 int index, bool enable, 302 struct wl12xx_rx_filter *filter) 303 { 304 int ret; 305 306 if (wl->rx_filter_enabled[index] == enable) { 307 wl1271_warning("Request to enable an already " 308 "enabled rx filter %d", index); 309 return 0; 310 } 311 312 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter); 313 314 if (ret) { 315 wl1271_error("Failed to %s rx data filter %d (err=%d)", 316 enable ? "enable" : "disable", index, ret); 317 return ret; 318 } 319 320 wl->rx_filter_enabled[index] = enable; 321 322 return 0; 323 } 324 325 int wl1271_rx_filter_clear_all(struct wl1271 *wl) 326 { 327 int i, ret = 0; 328 329 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) { 330 if (!wl->rx_filter_enabled[i]) 331 continue; 332 ret = wl1271_rx_filter_enable(wl, i, 0, NULL); 333 if (ret) 334 goto out; 335 } 336 337 out: 338 return ret; 339 } 340 #endif /* CONFIG_PM */ 341